Unlike standard firmware zip files, Unisoc phones often use a .pac file. This is a single, packaged archive containing the bootloader, recovery, system, and userdata partitions. Think of it as the master loader image.
The PAC file is corrupted or for a different Nokia 1.4 variant. Fix: Redownload the firmware ensuring the model number (TA-1325 vs TA-1333) matches exactly. nokia 1.4 loader